I agree with the other comment -- looks like maybe insect damage or (fungal?) infection, but I'm really not sure. You might try looking through Sue Bottom's Orchid Disease Guide (PDF), if you haven't already.
this post was submitted on 27 Jul 2025
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Definitely not sunburn. I think its some infection or pest, though I'm not sure what, probably pays to separate it from other orchids. Good luck, I hope it recovers